Echinoderms and Chordates Are Thought to Be More Closely Related

question 25

Multiple Choice

Echinoderms and chordates are thought to be more closely related that other phyla are to these groups because ____.

• A) both have embryonic cells with spiral cleavage
• B) both have embryonic cells with radial cleavage
• C) both have amniote eggs
• D) they lived at the same time
• E) both have embryonic cells with nested cleavage

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